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Journal of Materials Science

, Volume 29, Issue 9, pp 2328–2334 | Cite as

A study on the formation of liquation cracks in the weld heat-affected zone of HY-80 quenched and tempered steel

  • Rong-Iuan Hsieh
  • Shyi-Chin Wang
  • Horng-Yih Liou
Papers

Abstract

Liquation cracking of heat-affected zones (HAZs) is often encountered during the welding of HY-80 steels. To reduce the sensitivity of this defect, the content of impurities, such as P and S, must be kept as low as possible. However, in the development of HY-80 steel, HAZ grain boundary liquation is still found even at very low impurity contents. In order to clarify the cause of this defect, the Gleeble hot ductility test and electron probe X-ray microanalysis (EPMA) were carried out. From the results of EPMA, it was evident that the grain boundary liquation in the heat-affected zone of HY-80 steel was due to the low-melting-point eutectic reaction between Cr, Ni and Mn, which had been swept up by the migrating grain boundaries in the welding-heating thermal cycle, and hence enriched at the grain boundary. In addition, the Gleeble hot ductility test results revealed that the HAZ liquation cracking sensitivity of HY-80 steel could be decreased by reducing the C, Ni and Cr contents of base metal, and by decreasing the dwell time at high temperatures during the welding thermal cycle.

Keywords

Welding Ductility Base Metal Dwell Time Thermal Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Rong-Iuan Hsieh
    • 1
  • Shyi-Chin Wang
    • 1
  • Horng-Yih Liou
    • 1
  1. 1.R & D DepartmentChina Steel CorporationKaohsiungTaiwan

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